2 - alkyl - 2 - carboxyalkyl - 3 - carboxy or 3 - keto - n - (m - alkoxyphenethyl) cycloalkylamines



United States Patent US. Cl. 260-519 laims ABSTRACT OF THE DISCLOSURE The present invention discloses 2-alkyl-2-carboxyalkyl-3-carboxy or 3-keto-N-(m-alkoxyphenethyl) cycloalkylamines of the formula:

in which R and R are hydrogen, hydroxy, or lower alkoxy; R is hydrogen or lower alkyl, R is hydrogen or lower alkyl and R is hydrogen, -COOR in which R is lower alkyl and and R and R taken together with the carbon atom to which they are attached form a member selected from the group consisting of keto and cyclic ketal and Y is hydrogen, aralkyl and lower alkyl.

These compounds are useful as intermediates for the production of S-azasteroids.

This is a divisional application of our copending application Ser. No. 357,275, filed Apr. 3, 1964 now US. Patent No. 3,320,260, issued May 16, 1967.

This invention relates to a new and novel class of heterocyclic compounds. More particularly, this invention relates to novel substituted indolizines of the formula:

wherein R and R each represents hydrogen, hydroxy, or lower alkoxy such as methoxy or methylene dioxy; R represents hydrogen or lower alkyl such as methyl, ethyl, propyl, isopropyl, butyl or isobutyl; R represents hydrogen, lower alkyl such as methyl, ethyl, propyl, isopropyl, butyl or isobutyl; 'R represents hydrogen, -COOR in which R may be hydrogen or lower alkyl Patented Dec. 30, 1969 ice or R and R taken together with the carbon atom to which they are attached represent a keto radical such as or a cyclic ketal radical such as (C H2)n and n may be 1 or 2.

The symbols R R R R R R and n as used hereinafter have the same meaning as defined.

This invention also includes within its scope a novel process for the production of these compounds.

The compounds of this invention contain a fused tetracyclic ring system in which a substituted aromatic ring A is fused to the 7-8 face of indolizine nucleus of the formula The numbering of the fused ring system is indicated below and Exemplary of such indolizines are:

2,3,3a,5,6,10b,11,11a-octahydro-8-methoxy-lH-benzog] cyclopenta [b] indolizine 2,3,3a,5,6,10b,11,11a-octahydro-8 -methoxy-1la-methy1- lH-benzo [g] cyclopenta ['b] indolizine 2,3,3 a,5,6,l0b,11,11a-octahydro-8,9-dimethoxy-11amethyll-carbethoxy-cyclopenta [b] indolizine 2,3,3a,5,6,10b,11,11a-octahydro-S-hydroxy-lH-benzo- [g] cyclopenta [b indolizine 2,3,3 a,5,6,10b,l1,11a-octahydro-8-hydroxy-lla-methyllH-benzo [g] cyclopenta [b] indolizine 2,3,3a,5,6,10b,11,1la-octahydro-S-hydroxy-l la-methyl-lcarboxylH-benzo [g] cyclopenta [b] indolizine 2,3,3a,5,6,10b,11,1la-octahydro-S-rnethoxy-lla-methyllH-benzo[g]cyclopenta [b] indolizine-l-one 2,3,3a,5,6,1b,11,1la-octahydro-S-hydroxy-lla-methyllH-benzo [g] cyclopenta [b] indolizine-1 -one 1,2,3 ,4,4a,6,7,1 lb, 12, 12a-decahydro-9-methoxy-dibenz- [b, g] indolizine 1,2,3,4,4a,6,7,1 lb, 12, 12a-decahydro-9-methoXy-12amethyl-dibenz [b,g] indolizine 1,2,3 ,4,4a,6,7,11b,l2,12a-decahydro-9,104limethoxy-12amethyl-l-carbethoxy-dibenz [b, g] indolizine 1,2,3,4,4a,6,7,11b,12,12a-decahydro-9-hydroxy-dibenz- [b, g] indolizine 1,2,3 ,4,4a,6,7,11b,12,12a-decahydro-9-hydroxy-12amethyl-dib enz [b, g] indolizine 1,2,3,4,4a,6,7,11b,12,1Za-decahydro-9-hydroxy-12amethyl-l-carboxy-dibenz [b, g] indolizine 1,2,3,4,4a,6,7,11b,]2,l2a-decahydro-9-methoxy-12amethyl-dibenz [b, g] indolizinel-one 1,2,3 ,4,4a,6,7,11b,12,12a-decahydro-9-hydroxy-12amethyl-dibenz[b,g]indolizine-1-one The new and novel compounds of this invention resemble the steroids structurally and can be considered as C-nor-S-azasteroids and as such exhibit significant steroidal like properties. These properties include, for example, estrogenic, anabolic, and so on, and are, therefore, useful in the treatment of various endocrine disorders. They also exhibit other pharmacological properties, notably on the cardiovascular systems such as hypotensive effects in a mammalian host such as mice, dogs and the like. In order to use these compounds as hypotensive agents they are combined with standard pharmaceutical carriers such as lactose, dicalcium, phosphate, mannitol and the like to form dosage forms suitable for oral administration such as tablets or dispersible powders. They may also be combined With water or a vegetable oil to form dosage forms suitable for intramuscular or intravenous injections. In these dosage forms they are generally formulated at a concentration of about 0.1% to 1% by weight. A dosage regimen of about 0.1 mg. to 100 mg. several times daily is required to produce the desired hypotensive effect. In addition, they are important intermediates toward the preparation of other substituted indolizine compounds. Thus, for example, ring A wherein R is hydrogen and R is methoxy may be reduced employing alkali metals such as sodium in the presence of an alcohol such as ethanol in liquid ammonia to give, after hydrolysis with a dilute mineral acid such as hydrochloric, a compound of the formula:

or those compounds wherein R and R taken together is a ketone group may be reacted with acetylene to give an III We have found that compounds of this invention may be produced according to the following reaction sequence. The preparation of an intermediate lactam of the formula:

is accomplished by either of two methods. In the first method, substituted fl-phenethylamines of the formula:

and cycloalkanone-Z-acetic acids or the corresponding esters of the formula:

COOY

Such an intermediate can be catalytically reduced as decribed subsequently to give a saturated lactam such as W, or it can be cyclized to give a substituted indolizin of the Formula VI:

Exemplary of such indolizines are: 1,.2,5,6,1 1,1 la-hexahydro-8-methoxy-1 la methyl-l-oxo benzo [g] cyclopenta [b] indolizinium perchlorate 2,3,6,7,12,12a hexahydro-9-methoxy-l2a-methyl-1-oxolH-dibenz [b, g] indolizinium perchlorate 1,2,5,6,11,11a hexahydro-8-methoxy-1la-methyl-l-carbethoxy benzo[g]cyclopenta[b]ind0lizinium perchlorate 2,3,6,7,12,12a hexahydro-9-methoxy-12a-methyl-1-carbethoxy-lH-dibenz[b,g]indolizinium perchlorate and the like.

Agents which may be employed to effect this cycliza tion include, for example, phosphorous oxychloride and the like. Reduction of indolizines such as V1 with gaseous hydrogen in the present of a catalyst such as palladium on carbon or complex alkali metal hydrides such as sodium or potassium borohydrides yield the desired saturated indolizines of this invention. Alternatively the lactam V may be catalytically reduced with gaseous hydro- (CH2)D.

VII

Exemplary of indolizines such as VII are:

1,2,3,3a,5,6,1l,11a octahydro-8-methoxybenzo[g]cyclopenta [b] indolizinium bromide 1,2,3 ,3a,5,6,1 1,1 la octahydro-S-methoxy-l la-methylben- 20 [g] cyclopenta [b] indilizinium bromide 1,2,3,3a,5,6,11,11a octahydro-8-methoxy-1la-methyl-lcarbethoxy benzo[g]cyclopenta[b]indolizinium bromide' l,2,3,3a,5,6, 1 1,1 la-octahydro-S-hydroxy-benzo [g] cyclopenta[b]indolizinium bromide l,2 ,3,3a,5,6,11,1la-octahydro-8-hydroxy-1la-methylbenzo [g] cyclopenta [b] indolizinium bromide 1,2,3,3a,5,6,11,l1a octahydro-8-hydroxy-1la-methyl-lcarboxybenzo [g] cyclopenta [b] indolizinium bromide l,2, 3,3a, 5,6,1l,lla octahydro-8-methoxy-1la-methyl-loxobenzo [g] cyclopenta [b] indolizinium bromide 1,2,3,3a,5,6,l1,l1a octahydro-S-hydroxy-lla-methyl-loxobenzo [g] cyclopenta [b] indolizinium bromide 2,3,4,4a,6,7,l2, 12a -octahydro-9-IO-dimethoxy-lH-dibenz- [b,g] indolizinium bromide 2,3,4,4a,6,7,l2,12a octahydro 9 methoxy-lZa-methyllH-dibenz [b, g] indolizinium bromide 2,3,4,4a,6,7,12,l2a octahydro 9 methoxy-lZa-methyll-carbethoxy-lH-dibenz [b, g] indolizinium bromide 2,3,4,4a,6,7,12,l2a octahydro-9-10-dihydroxy-1H-dibenz- [b,g]indolizinium bromide 2,3,4,4a,6,7, 12,12a octahydro-9-hydroxy-ljZa-methyl-1H- dibenz[b,g]indoliziniurn bromide 2,3,4,4a,6,7,12,l2a octahydro-9-hydroxy-l2a-methyl-lcarboxy-lH-dibenz[b,g]indolizinium bromide 2,3,4,4a,6,7,12,12a octahydro-9-rnethoxy-1-oxo-1H-l2amethyl-dibenz[b,g]indolizinium bromide 2,3,4,4a,6,7,l2,l2a octahydro-9-hydroxy-l-oxo-lH-l2amethyl-dibenz[b,g]indolizinum bromide and the like.

These indolizines may then be further reduced to compounds which correspond to structural Formula I. Such reduction reactions may be carried out by employing any one of the reduction methods such as the use of gaseous hydrogen in the presence of a catalyst such as palladium on carbon or of complex alkali metal hydrides such as sodium borohydride.

The reaction sequence when carried out according to the above procedures leads predominantly to one of the two possible configurations about the C-D ring fusion. By employing the following alternate condensation method we can obtain both of these steric configurations about this ring junction thereby giving two isomers. In this second procedure, the starting substituted it-phenethylamine and cycloalkanone-Z-acetic acid or ester are subjected to a reductive condensation carried out in a suitable solvent, such as methanol, ethanol or isopropanol over a hydrogenation catalyst such as palladium on carbon. Under these reaction conditions, there is formed a mixture of two isomeric amino acids if cycloalkanone- 2-acetic acid is one of the starting materials or two isomeric amino esters if the corresponding ester is employed as the starting material. The isomeric amino acids correspond to the formula:

VIII

Exemplary of such amino acids are:

cis and trans Z-carbOXymethyl-N-(m-methoxyphenethyl)- cyclopentylamine cis and trans 2-methyl-2-carboxymethyl-N-(m-methoxyphenethyl) -cyclopentylamine cis and trans Z-methyl-Z-carboxymethyl-3-carboxy-N- (m -methoxyphenethyl) -cyclopentylamine cis and trans 2-methyl-2-carboxymethyl-3-keto-N-(mmethoxyphenethyl -cyclopentylamine cis and trans Z-carboxymethyl-N-(3,4-dimethoxyphenethyl) -cyclohexylamine cis and trans 2-methyl-2-carboxymethyl-N-(m-methoxyphenethyl) -cyclohexylamine cis and trans Z-methyl-Z-carboxymethyl-3-carboxy-N- (m-methoxyphenethyl) -cyclohexylamine cis and trans Z-methyl-2-carboxymethyl-3-keto-N-(mmethoxyphenethyl)-cyclohexylamine and the like.

These isomeric amino acids may be readily separated by taking advantage of the fact that the cis isomer undergoes cyclization to give the earlier-described saturated lactam IV, under much milder conditions than occurs with the trans isomer. Thus, for example, in some cases, the cis isomer actually cyclizes to the lactam spontaneously during the reductive condensation step. In those cases in which a mixture of the amino acids is obtained from the reductive condensation, it is usually sufficient to merely dissolve the amino acid mixture by heating in an inert solvent such as acetonitrile or isopropanol to bring about the cyclization of the cis amino acid. The trans amino acid IX is recovered in pure form by cooling the solution and filtering, and the cis compound can then be obtained pure in the lactam form by concentrating the solution to dryness and washing the residue with water to remove residual traces of trans amino acid.

The pure cis lactam and trans amino acid can then be cyclized in the usual way with an appropriate cyclization reagent, such as phosphorous oxychloride, to afford the two isomeric substituted indolizines corresponding to structure VII. Alternatively, the pure trans amino acid may be converted to the trans lactam corresponding to structure IV by heating to its melting point, and this product then cyclized to the indolizine corresponding to structure VII.

These indolizines may exist in the form of the quaternary salt VII, or may be converted to the free base by treatment of the quaternary salt with an aqueous alkali such as sodium hydroxide, ammonium hydroxide and the like. Such free bases have the Formula X:

Exemplary of indolizines such as X are:

2,3,3a,5,6,11a-hexahydro-8-methoxy-lI-I-benzog] cyclopent [b indolizine 1,2,3,4,4a, 6,7, l2a-0ctahydro-9-methoxydibenz- [b,g] indolizine 2,3,3a,5,6,1 1a-hexahydro-8-rnethoxy-l-oxo-1 la-methyllH-benzo [g] cyclopent [b indolizine 1,2,3,4,4a,6,7, l2a-octahydro-9-methoxy-l-oXo-lZamethyldibenz[b,g] indolizine 2,3,3a,5,6,1 la-hexahydro-S-methoxy-l-carbethoxy-l lamethyl-lH-benzo [g] cyclo pent [b indolizine 1,2,3,4,4a,6,7,l2a-octahydro-9-methoxy-l-carbethoxy- 12a-methyldibenz[b,g] indolizine and the like.

The following examples are given in order to further illustrate the present invention. All temperatures given are in the centigrade scale.

EXAMPLE 1 Cis and trans-Z-carboxymethyl-N-(m-methoxyphenethyl) -cyclohexylamine A mixture of 1.51 grams (1O mmoles) of m-methoxyphenethylamine, 1.56 grams (10 mmoles) of cyclohexanone-2-acetic acid, 0.5 gram of 10% palladium on charcoal catalyst and 50 ml. of ethanol is hydrogenated at ambient temperature and 50 p.s.i. pressure until hydrogen absorption is complete (ca. 16 hours). The catalyst is filtered, and the solvent removed by vacuum distillation. The white solid residue is warmed with 50 ml. isopropanol, cooled, diluted with a little ether and filtered after one hour to give pure cis 2-carboxymethyl-N-(mmethoxyphenethyl)-cyclohexylamine as White crystals, M.P. 133-4 which may be recrystallized from water. The filtrate is concentrated to dryness and the white solid residue is triturated with water and filtered to give another small amount of the cis acid. The filtrate is concentrated to dryness and triturated with acetone to give pure trans 2 carboxymethyl-N-(m-methoxyphenethyl)-cyclohexylamine as white crystals, M.P. 1345. Thin layer chromatography using silica gel as the stationary phase and a 75-25 mixture of methanol-acetone as the moving phase (iodine as developing agent) shows the cis and trans amino acids as sharp spots of R =0.4 and 0.5, respectively.

EXAMPLE 2 Cis-2,3,4,4a,6 ,7,12,12a-octahydro-9-methoxy-1H- dibenz[b,g]indolizinium bromide A slurry of 7.4 grams of cis 2-carboxymethyl-N-(mmethoxyphenethyl)cyclohexylamine in 300 ml. benzene containing 50 ml. of phosphorous oxychloride is refluxed for two hours. The mixture is concentrated under reduced pressure to a yellow oil. The oil is dissolved in 200 ml. of water, chopped ice is added, and the mixture is made basic with 5% sodium hydroxide solution. The precipitated oil is extracted with ether. The ether is dried over magnesium sulfate, and dry hydrogen bromide is passed in. The precipitated yellow oil crystallizes on rubbing with isopropanol. The yellow solid is recrystallized from isopropanol to give cis-2,3,4,4a,6,7,l2,l2aoctahydro 9 methoxy-lH-dibenz[b,g]indolizinium bro mide as yellow crystals M.P. 1758. The quaternary perchlorate can be prepared by treating the bromide with dilute perchloric acid, and melts at 116-18 after recrystallization from ethanol.

The quaternary salt can be dissolved in water and made basic by addition of dilute alkali to give a precipitate of the free base, cis-l,2,3,4,4a,6,7,l2a-octahydro-9-methoxydibenz[b,g]indolizine as a yellow oil.

EXAMPLE 3 Trans-2,3,4,4a,6,7,12,12a-octahydro-9-hydroxylH-dibenz[b,g]indoliziniurn perchlorate In the same way as described in Example 2, 3.0 grams of trans-hexahydro-l-(m-methoxyphenethyl)-2-indolinone in a mixture of 150 ml. of benzene and 30 ml. of phos phorous oxychloride are cyclized to give trans-2,3,4,4a,6,

8 7,12,12a-octahydro-9 methoxy 1H dibenz[b,g]indolizinium perchlorate, as white plates, M.P. l823 after recrystallization from ethanol.

The free base, trans-l,2,3,4,4a,6,7,l2a-octahydro-9 methoxydibenz[b,g]indolizine is obtained as white crystals, M.P. 92-4, in the same way as described in Example 2.

EXAMPLE 4 'lrans-2,3,4,4a,6,7, l 2, l2a-octahydro-9-hydroxylHdibenz[b,g]indolizinium bromide A solution of 2.7 grams of trans-2,3,4,4a,6,7,12,1221- octahydro-9-methoxy 1H dibenz[b,g]indolizinium perchlorate in 10 ml. of acetone is poured into 200 ml. of 5% sodium hydroxide solution. The precipitated solid is extracted with 2 portions of 25 ml. each of 48% hydrobromic acid, and the combined hydrobromic acid solutions are refluxed for 6 hours. This solution is concentrated to dryness under reduced pressure and the oily residue is crystallized by rubbing with isopropanol. The crude solid is filtered and recrystallized from n-propanol to give trans-2,3,4,4a,6,7,l2,l2a-octahydro-9-hydroxy-1H- dibenz[b,g]indolizinium bromide, as a white powder, M.P. 269-71".

EXAMPLE 5 Cis-2,3,4,4a,6,7, l 2, l2a-octahydro-9-hydroxy-1H- dibenz[b,g]indolizinium bromide A solution of 5.0 grams of cis-2,3,4,4a,6,7,12,l2a-octahydro-9-methoxy-1H-dibenz[b,g]indolizinium bromide in ml. of 48% hydrobromic acid is refluxed for 6 hours. The solution is concentrated to a solid which is recrystallized from methanol to give cis-2,3,4,4a,6,7,12,12a-octahydro-9-hydroxy-1H-dibenz[b,g]indolizinium bromide as white crystals, M.P. 2779.

EXAMPLE 6 Trans-2-carboxymethyl N (m-methoxyphenethyl)cyclopentylamine and cis-3,3a,4,5,6,6a hexahydro l-(mmethoxyphenethyl cyclopenta [b] pyrrol-Z- 1H) -one In the same way as described in Example 1, 7.55 grams of m-methoxyphenethylamine and 7.10 grams of cyclopentanone-Z-acetic acid are subjected to reductive condensation in 200 ml. ethanol over 1.0 gram 10% palladium on carbon catalyst. The white residue from removal of the catalyst and solvent is slurried in 300 ml. of acetonitrile and the mixture refluxed with stirring for 15 minutes. It is cooled and filtered to give trans-Z-carboxymethyl-N-(mmethoxyphenethyl)cyclopentylamine as a pure white solid, M.P. 1945.

The acetonitrile filtrate is concentrated to an oil. The oil is dissolved in ether, and the ether washed with a 5% solution of sodium bicarbonate, dried over magnesium sulfate and concentrated to give cis-3,3a,4,5,6,6a-hexahydro l m-methoxyphenethyl)cyclopenta[b]pyrrol-2- (1H)-one as an oil.

EXAMPLE 7 Cis-1,2,3,3a,5,6,1 1,1 1a-octahydro-8-methoxybenzo [g] cyclopent[b]indolizinium bromide In the same way as described in Example 2, 4.3 grams of cis 3,3a,4,5,6,6a-hexahydrol-(m-methoxyphenethyl) cyclopenta[b]pyrrol-2-(lH)-one are cyclized with 15 ml. of phosphorous oxychloride in ml. of benzene to give cis-1,2,3,3a,5,6,l1,lla octahydro 8 methoxybenzo[g] cyclopent[b]indolizinium bromide as a yellow oil. The quaternary perchlorate is prepared from the bromide, and melts at 121-5 after recrystallization from isopropanol. The free base cis-2,3,3a,5,6,lla-hexahydro-S-methoxy-IH- benzo[g] cyclopenta[b]indolizine is obtained from the salt described in Example 4, and is a yellow oil.

9 EXAMPLE 8 Trans-1,2,3,3a,5 ,6,1 1,1 la-octahydro-S-methoxybenzo [g] cyclopent [b] indolizinium perchlorate A solution of 0.5 gram of trans-2-carboxymethyl-N- (m-methoxyphenethyl) cyclopentylamine in ml. of phosphorous oxychloride is held at 100 for 2 hours, then evaporated to dryness. The oily residue is dissolved in water and 10% perchloric acid is added until precipitation is complete. The pale yellow solid is filtered to give transl,2,3,3a,5,6,l 1,1 la-octahydro 8 methoxybenzo[g]cyclopent[b]indolizinium perchlorate as white needles, M.P. l724 after recrystallization from ethanol. The free base, trans-2,3,3a,5,6-1la-hexahydro 8 methoxy-lH-benzo- [g]cyclopent[b]indolizine is obtained from the salt as described in Example 2 and is a white solid, M.P. 61-3.

EXAMPLE 9 Trans-1,2,3,3a,5,6,1 1, 1 1a-octahydro-S-hydroxybenzo [g] cyclopent[b]indolizinium bromide In the same Way as described in Example 6, a solution of 5.0 grams of trans-l,2,3,3a,5,6,11,11a octahydro 8- methoxybenzo [g] cyclopent [b] indolizinium perchlorate is demethylated with 100 ml. of hydrobromic acid to give trans-l,2,3,3a,5,6,ll,lla-octahydro 8 hydroxybenzo[g] cyclopent[b]indolizinium perchlorate, M.P. 300 after recrystallization from ethanol.

EXAMPLE 10 Cis-l,2,3,3a,5,6,1 1,1 la-octahydro-8-hydroxybenzo [g] cyclopenta [b] indolizinium bromide In the same way as described in Example 6, 4.8 grams of cis-l,2,3,3a,5,6,11,11a-octahydro-8 methoxybenzo[g] cyclopent[b]indolizinium perchlorate is demethylated with 100 ml. of 48% hydrobromic acid to give cis-l,2,3,3a,5,6, 11,1la-octahydro-8 hydroxybenzo [g] cyclopenta[b]indolizinium bromide as white crystals, M.P. 2456 after recrystallization from acetonitrile.

EXAMPLE 11 2,3,3a,5,6,10b,11,11a-octahydro-S-methoxy-lH-benzog] cyclop enta ['b] indolizine hydrobromide A solution of 0.5 gram of trans-1,2,3,3a,5,6,11,1laoctahydro 8 methoxybenzo[g]cyclopenta[b]indolizinium perchlorate in 50 ml. of methanol is treated with 1.0 gram of potassium borohydride. The mixture is left for 1 hour at ambient temperature, then evaporated to dryness. The residue is partitioned between ether and water. The ether phase is dried over magnesium sulfate and dry hydrogen bromide passed in. The precipitate is filtered to give 2,3,3a,5,6,10b,11,1la-octahydro-S-methoxy-lH-benzo [g] cyclopenta [b] indolizine hydrobromide as a white solid, M.P. 1969.

It is to be understood that the foregoing detailed description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of our invention.

Having described our invention, what we desire to secure by Letters Patent is:

1. A compound selected from the group consisting of the stereoisomers and mixtures thereof represented by the formula:

wherein R and R each is a member selected from the group consisting of hydrogen and lower alkoxy, R is a member selected from the group consisting of hydrogen and lower alkyl, R; is hydrogen, R is a member selected from the group consisting of hydrogen, and -COOR in which R is hydrogen, and R and R taken together with the carbon atom to which they are attached form a keto group, and Y is hydrogen, and n is l or 2.

2. The compound of claim 1 which is 2-carboxymethyl- N- m-methoxyphenethyl) -cyclopentylamine.

3. The compound of claim 1 which is Z-methyl-Z-carboxymethyl-N-(m-methoxyphenethyl)-cyclopentylamine.

4. The compound of claim 1 which is 2-methyl-2-carboxymethyl 3 carboxy-N-(m-methoxyphenethyl)-cyclopentylamine.

5. The compound of claim 1 which is 2-methyl-2-car- 'boxymethyl-3-keto-N- (m-methoxyphenethyl) -cyclopenty1- amme.

6. The compound of claim 1 which is Z-carboxymethyl- N-(m-methoxyphenethyl)-cyclohexylamine.

7. The compound of claim 1 which is 2-methyl-2-carboxymethyl-N- (m-methoxyphenethyl) -cyclohexylamine.

8. The compound of claim 1 which is 2-methyl-2-carboxymethyl 3 carboxy-N-(m-methoxyphenethyl)-cyclohexylamine.

9. The compound of claim 1 which is 2-methyl-2-carboxymethyl 3 keto N (m-methoxyphenethyl)-cyc1ohexylamine.

References Cited Meltzer, R. I.: Chemical Abstracts (1963), vol. 59, pp. 15343e to 15344c relied on.

LORRAINE A. WEINBERGER, Primary Examiner L. ARNOLD THAXTON, Assistant Examiner U.S. Cl. X.R. 

